All have same oxidation number for sulphate, i.e +6. (a) Oxidation number of S is 2 4 H SO 2 x 8 0 x 6 (b) Oxidation number of S in SO3 x 6 0 x 6 (c) Oxidation number of S in H2S2O7 2 2x 14 0 2x 12 x 6 [where, x = Oxidation number of sulphur (S)]
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